Yeah, personally I don't see the need for additives/extras, nothing against them but I can get close to 1 oz per gallon without them with decent producing strains like Blue Dream, good enough for me. Haven't used coco, I'd spend some time in the forums looking around and posting questions, lots of folks in here that grow in coco and could offer some tips. I understand it's similar to growing in similar soiless medium like pro-mix so I'd think I'd want to start feeding early in low doses. I really like the mix of triple-mix and hp pro-mix indoor, I can put seeds & clones straight into it, not too hot but enough to carry them for a few weeks with the odd low feed if needed in veg. In flowering it's a good medium, no packing, good water retention. Once they've been in flowering for a few weeks there's not much left in the soil so they get their nutrients from the feedings. Once I got it dialed in it's one of the few things I haven't changed, been using it for about 3 years. Lots of other things to play with and learn, it's a never ending hobby, always something new to learn